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(No Model.)

J. BOND, Jr.

VALVE GEAR.

No. 307,000. Patented 000. 21, 1884.

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JOSEPH BOND, JR., OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE- HALFTO CHARLES M. SVAIN, OF SAME PLACE.

VALVE-GEAR.

- SPECIFICATION forming part of Letters Patent No. 307,009, datedOctober 21l 1884.

Application filed .Tune 2, 1884.

To LZZ whom z5 may concern:

Be it known that I, JOSEPH BOND, Jr., a citizen of the United States,and a resident of Philadelphia, Pennsylvania, have invented certainImprovements in Valve-Gear for Steam- Engines, of which the following isa specification.

One object of my invention is to dispense with the usual link-motionreverse-gear for io the valves of steam-engines, and a further object isto impart a quick throw to the valve. These objects I attain in themanner hereinafter set forth, reference being had to the accompanyingdrawings, in which- Figures l and 2 are views in different positions ofthe valve driving and reversing gear forming the subject of myinvention, Fig. 3, a perspective view of the same; Figs. 4. and 5,diagrams illustrating the action of part of the 2o valve-gear, and Fig.6 a modification of the latter.

rIhe valve D which I employ is similar to that described and claimed inmy application filed February 14, 1884, Serial No. 120,700, and

hence will not require full illustration or detailed description. Itwill suffice to say that the valve has ports so arranged in respect tothose of the cylinder that the engine is reversed by longitudinallyshifting the valve.

The present invention consists of a device for shifting the valvewithout interfering with the throw of the eccentric. The valve-stem wisconnected by a rod, s, and pin s to the upper end of an arm, P, thelower end of 3 5 which is pivoted to a pin, t, carried by an arm, S,which is secured to a rock-shaft, t, adapted to bearings in a bracket onthe frame of the engine, or on some other available support, anotherarm, V, on this shaft being connected 4o by a rod, V, to the usualreversing-lever. In

the case of a locomotive or other double engine the shaft t will befurnished with two arms, S, one for each engine, but both operated bythe same reversing-lever. The eccentric-rod T is connected by a pin, u,to a link,-

c, which is hung to a projection, fv, on the arm P. It is advisable toimpart a quick throw to the valve, and in order to effect this resultwith the usual eccentric I so construct 5o the connection between saideccentric and the arm P as to permit a certain amount of play,

(No model.)

so that the first part of the throw of the eccentric in eitherdirection, being a slow movement, is lost, the eccentric not beginningto act on the arm until it reaches that part of its throw where themovement is comparatively rapid. To accomplish this result the openingin the link c for the reception of the projection c on the arm P is madeiiaring at each end, the sidesm 2 2 of the opening and the sides 6o 1 1of the projection being convex and touching each other at the twoopposite points, 3 3, and the'opposite ends, 4t 4, of the opening beingsegmental and bearing on the ends 5 5 of the projection. By this meansthe first part of the throw of the eccentric in either direction willsimply swing the link c without imparting any movement to the arm P, thelatter not being brought under the control of the eccentric until thelink reaches the position 7o shown in Fig. et, or that shown in Fig. 5,where the points 3 3 bind on the convex surfaces l 1 and lock the linkto the projection c. The extent of this lost movement will depend uponthe convexity of the surfaces 1 1. Thus the 75 shorter the radius of thesame the longer will be the movement, and vice versa. The movement ofthe arm P by the reversing-gear is effected by the movement of the armS, which carries the pivot-pin t of the arm P, the move- 8o ment beingfrom the position shown in Fig. 1 to that shown in Fig. 2, or thereverse. When the pin t is shifted, the arm P iirst swings on the pin suntil the link 'v becomes locked to the projection c', whereupon the pin8 5 u becomes the fulcrum, and there is a movement of the upper end ofthe arm P and of the valve-rod commensurate with the movement necessaryfor the reversal ofthe engine, as above described. 9o

A slide or equivalent shifting carrier for the pivot-pin t maybeemployed, i-f desired, in place of the arm S. The reversing movement ofthe arm P is wholly independent of the movement imparted by theeccentric.

Various means of connecting the eccentricrod to the arm P, so as toprovide for the desired lost motion, may be adopted. In Fig. 6, forinstance, I have shown a device in which the link o is pivoted at itsupper end to the vico arm P, and swings between inclined lugs o2 on saidarm, the link failing to exercise any control over the arm until itcomes into contact With one or other of the lugs. The device shown inFigs. 1 and 2 is, however, preferred, as it Will Work more smoothly,owing to the fact that the link t has at all times a bearing on theprojection c.

My improved reversing device can be used in connection with any valvehaving ports so arranged as to reverse the engine by longitudinallyshifting the valve.

It Will be observed that the reversal of the valve in my improved gearis effected by a simple movement of the pivot t in the direction ofmovement of the valve-rod and eccentric-rod, there being no verticalmovement of the arm l? in the operation of the gear, as in that class ofgears in which a lever connected to the valve and eccentric rods is hungto a link so that the pivot swings in the are of a circle.

I claim as my invention-d l. The combination of a valve, D, with areversing device, consisting of the arm P, connected to the valve-rodand eccentric-rod, anda pivot, f, occupying a iixed position during theWorking of the valve, but adjustable in the direction of movement of thevalverod and eccentric-rod, in order to reverse the valve, as set forth.

2. The combination of a valve, D, the pivoted arm l?, connected thereto,the eccentricrod T, and the link o, connected to the arm, as described,whereby the first portion ofthe throw of the eccentric in eitherdirection is Without effect on the arm, as set forth.

3. rlhe combination of the valve, the pivoted arm l?, connected thereto,and having a projection, of, with convex sides l, the eccentric-rod T,and the link lv, having an opening for the reception of the projectiono', said opening having a bearing on the convex sides ofthe projection tat the opposite points, 3 3, as set forth.

In testimony whereof l have signed my name to this specification in thepresence of 45 two subscribing Witnesses.

JOSEPH BOND, JR. Witnessesz JOHN M. CLAYTON, HARRY SMITH.

